Physicians' perceptions of compliance and attitudes toward complementary care
31 surveyed physicians perceived that between one-third and two-thirds of patients do not comply with instructions, and that nearly one-third of those who comply do not show optimal treatment response. The physicians expressed concerns about the validity and cost of complementary approaches that might increase medical compliance and enhance treatment response.
Daugherty, Timothy K., Katrina Sherenco, Harold Davis, and Melissa McClelland. "Physicians' perceptions of compliance and attitudes toward complementary care." Psychological reports 93, no. 2 (2003): 479-480.